Balana Marie Michel (left) and Foumena Marie Gaelle, who have gone missing. The girls, who speak only French, had no passports with them and were carrying just £10 each. Photograph: GMP/PA

Two 16-year-old athletes from Cameroon have gone missing after competing in the Commonwealth Youth Games on the Isle of Man.

Balana Marie Michel and Foumena Marie Gaelle were last seen at Manchester airport's terminal 3, where they had been due to board a flight home that connected in Brussels.

The flight was due to leave Manchester at 6.30am on Wednesday but the girls did not get on the plane.

Both teenagers had represented their country in 100m and 200m sprint events at the games.

Police are concerned for their welfare as they have no passports and only a small amount of cash.

It is believed the athletes both have a black Puma rucksack bearing the Cameroon flag and £10 each but no other money or cards. Their coach had retained their passports.

The girls speak only French and have no friends, family or contacts in the UK, police added.

Detective Constable Andy MacNab said: "We believe the girls walked off of their own free will but we are extremely concerned for their welfare as they have little money and absolutely no one to turn to in this country.

"We would urge anyone who has seen them or knows where they are to contact us.

"Also, it is quite likely that the girls are feeling frightened and confused after a night in a city they do not know.

"Girls, if you can hear or see this appeal: please walk into a police station, you are not in any trouble with us and we can get you some help and support."